@charset "utf-8";
body{
	background: url(../img/背景.png) no-repeat;
	background-size: cover;
	margin: 0;
	padding: 0;
	overflow: hidden;/*超出body部分隐藏*/
}

#screen{
	width: 900px;
	height: 633px;
	margin: auto;
	padding: 0;/*内外间距为0*/
}
.botton_black{
	width: 100%;
	height: 50px;
	background:black;
	opacity: 0.7;
	position:absolute ;
	bottom: 0px;
}

.botton_black .start_game,
.botton_black .stop_game{
	width: 192px;
background: url(../img/按钮.png) no-repeat;
    background-size: auto;
background-size: 189px 32px;
position: absolute;
bottom: 10px;
left: 13px;
cursor: pointer;
text-align: center;
font-size: 23px;
font-weight: bold;

}
.botton_black .start_game{
	left: 250px;
	background: url(../img/按钮.png) no-repeat;
	background-size: 189px 32px;
}
#score{
	width: 250px;
	height: 200px;
	background: url(../img/积分器.png) no-repeat;
	background-size: 250px 200px;
	position:  absolute;
	right: 10px;
	bottom: 250px;
	font-family: "微软雅黑";
	text-align: center;
	font-size: 100px;
	line-height: 197px;
}
.letter{
	width: 200px;
	height: 200px;
	font-size: 0;
	border: 0;
	position: absolute;
}
